Performance Characterization of Voice over Wireless LANs Lionel PEREZ June 2nd, 2005

Master Thesis Project - Lionel Perez – June 2005 — 2 Agenda > Abstract > Specific Tasks > Available Material > Achieved Tasks > References > Support > Related Work

Master Thesis Project - Lionel Perez – June 2005 — 3 Abstract > VoIP over WLANs, the « killer application » > Inexpensive and convenient mobile telephony > Good voice quality required for success > Can IEEE WLANs provide such quality?

Master Thesis Project - Lionel Perez – June 2005 — 4 More parameters than wired LAN ! > Loss, Delay, Jitter > Impact of rate adaptation, power management on loss, delay, jitter > Impact of encrypction on loss, delay, jitter > Impact of RTS/CTS on loss, delay, jitter > Association performance, Authentication performance, > Roaming time, Rate adaptation time, > QoS (EDCF, WMM, WMM-SA) > Packet size

Master Thesis Project - Lionel Perez – June 2005 — 5 Abstract > Purposes of the project: Characterize the performance of a telephony solution based on Voice over IP over Wireless LANs (VoWLAN) Conduct measurements and simulation to identify the most significant parameters impacting voice quality Market and Strategy requirements: – Avoid time and cost-intensive tests – Independence from OEMs

Master Thesis Project - Lionel Perez – June 2005 — 6 Proposed Tasks 1/2 > Learn about the relationship between traffic parameters (delay, jitter, packet losses) and voice quality (MOS,E- model: R-Value) > Explore different scenarios that directly impact these parameters: the QoS mechanisms implemented (802.11e)? the security features (802.11i)? a,b or g ? the codec (opt)? the signalling protocol (opt)?

Master Thesis Project - Lionel Perez – June 2005 — 7 Proposed Tasks 2/2 > Perform measurements of these parameters under the different possible considerations > Use the ns2 network simulator or other (OMNET++?) to model and simulate some of these configurations > Define key tests to be conducted in order to ensure a given performance

Master Thesis Project - Lionel Perez – June 2005 — 8 Available Material > The « alpha test »: the VoWLAN solution deployed in our premises > The «platform» (testing lab) > PCs and laptops equiped with NICs > Wireless Switches, Access Points, Wifi phones > Professional measurement tools: 2 Veriwave Tests Units Wildpacket’s Airopeek Airmagnet Laptop Ixia Ixchariot

Master Thesis Project - Lionel Perez – June 2005 — 9 Achieved Tasks > Bibliographical Research Complete > Read the key articles > Understand the available tools > Discover ns2 > During the internship: Discover Alcatel’s VoWLAN Solution Evaluate Sigmum Wiplan (Planning Software) Conduct Site Surveys Basic mock-up configuration The VoWLAN toolkit

Master Thesis Project - Lionel Perez – June 2005 — 10 Related Work > “Can I add a VoIP call?”, S. Garg and M. Kappes > Voice over IEEE b Capacity, Coupechoux, Kumar, Brignol (Alcatel), 2004 > Simulation of e > Basic security features (WEP) > New QoS mechanisms? > New Security mechnisms? > New Power Management mechanisms?

Master Thesis Project - Lionel Perez – June 2005 — 11 Support > Supervisor: Michel Mouton > Additional Support: Jean-Michel Lauriol Daniel Le Bars The WLAN team: Architecture, QoS, Security, Interoperability, OXE/OXO

Master Thesis Project - Lionel Perez – June 2005 — 12 Thank you.

Master Thesis Project - Lionel Perez – June 2005 — 13 OXE-WLAN solution UA ACS WLAN OmniAccess SLK D:28 OmniSwitch Router SVP Server (with GK) Management: Port Vlan 99 Voice: Port Vlan 31 Data: Port Vlan 30 CS GD UA NAT : SLK E:69 SLK BE:01 IP IP SLK DD: Vlan Voice: Vlan Data: Vlan Management: Laptop Radius, TFTP OXE